2019 Buick Encore ELECTRICAL SYSTEM,EXTERIOR LIGHTING,ENGINE

My suv dies while im driving it. The engine stalls the lights go off. Its very dangerous I had a semi truck behind me last night and my encore basically became invisible. No lights no power, nothing. He almost hit me. Ive had this encore to several mechanics and none of them knows what the problem is. There are no warning lights on and it does not show any codes when hooked up to a diagnostic machine. I have called Buick Corp.and she told me to take it to a mechanic.

I got my car from Buick of Long Island City I was giving the wrong key mess up battery the car will not start and I crashed

WHILE DRIVING DOWN THE ROAD THE VEHICLE TURNS ITSELF OFF. HEADLIGHTS GO OFF AND THERE IS NO CONTROL OF THE VEHICLE. SOMETIMES THE VEHICLE WILL CRANK ITSELF WITHOUT TOUCHING THE START BUTTON. SOMETIMES SEVERAL TIMES BEFORE IT WILL REMAIN ON LONG ENOUGH TO START DRIVING AGAIN. IT IS VERY DANGEROUS TO DRIVE BECAUSE YOU HAVE NO CONTROL OVER THE VEHICLE AT THE TIME OF ENGINE SHUTDOWN. IT DOESN'T MATTER IF IT IS HIGHWAY SPEEDS OR IN TOWN. TONIGHT IT TOOK OVER 2 HOURS TO TRAVEL A NORMAL 20 MINUTE DRIVE. IT ALL STARTED 27 FEB 21 AND TODAY (28 FEB 21) IT IS PROGRESSIVELY GETTING WORSE. MOST OF THE TIMES THAT IT HAPPENS A BELL WILL DING 4 TIMES AND RIGHT AFTER THE BELL CHIMES THE ENGINE IMMEDIATELY SHUTS OFF. ALL LIGHTS EXTINGUISH, IT LOSES STEERING CONTROL AND BRAKES ARE MINIMIZED.